常見 E-Mail 電子郵件系統寄件失敗錯誤訊息

電子郵件系統錯誤訊息，常見原因：

[失敗重寄]
暫時性失敗，系統會定期重新遞送。

1. 被yahoo擋信
'RETRY.0 421 4.7.0 (GL01) Message from (163.26.1.63) temporarily deferred - 4.16.50. Please refer to http://postmaster.yahoo.com/errors/postmaster-21.html



2. 收信伺服器要求稍後再送
'RETRY.0 421 Please try again later
'RETRY.1 451 A.18 Please try again later(5min)

3. 無法連線收件者郵件伺服器
'RETRY.3 Connection timed out'
'RETRY.17 Temporary failure of hostname lookup'
'RETRY.8 420 Resources unavailable temporarily. Please try later (mta1023.mail.tp2.yahoo.com)'
'RETRY.0 421 Service unavailable - try again later'

4. 網路不通
'RETRY.23 Read/Write error over network connection'

5. 連線被拒
'RETRY.14 Connection refused'
'RETRY.21 Connection reset by peer'

6. 其他原因

(1). 記憶體不足
'RETRY.19 452 4.3.1 Out of memory'

(2). 信箱已爆
'RETRY.24 452 4.2.2 Mailbox full'

[送信失敗]
永久性失敗，系統不會再遞送，並將退信錯誤訊息通知發信人。

常見原因：

1. 查無此人
'FAIL 550 Recipient address rejected: User unknown in local recipient table
'FAIL 550 5.1.1 Recipient address rejected: '
'FAIL 554 delivery error: Sorry your message to xxxxxx@yahoo.com.tw cannot be delivered. This account has been disabled or discontinued (#102). - mta1007.mail.tp2.yahoo.com'
'FAIL 550 5.1.1 Recipient address rejected: User unknown in virtual alias table'
'FAIL 550 User unknown.
'FAIL 550 Requested action not taken: mailbox unavailable'
'FAIL 554 delivery error: This user doesnt have a yahoo.com account'
'FAIL 550 5.1.1 http://mail.google.com/support/bin/answer.py?answer=6596'
'FAIL 550 5.7.1 Unable to relay for xxxxx@4pmail.ylib.com'

2. 找不到收信者郵件伺服器
'FAIL Hostname cannot be resolved'

3. 信箱已爆
'FAIL 552 sorry, that message size exceeds my databytes limit (#5.3.4)'

4. 信件過大
'FAIL This account only accepts mail less than 8192000 bytes'

5. 收信者郵件伺服器拒收
'FAIL 554 mail server permanently rejected message (#5.3.0)
'FAIL 550 Blocke
'FAIL 554 Relay access denied'
'FAIL 550 Relaying denied. Proper authentication requir.